| 摘要 |
<p>A non-isolated battery charger having a capacitor (C1) for direct connection to an AC source (S), provides rectified DC current from a diode bridge (12) to the battery (B) being charged. A thermostat (TS1') in a heat conducting relationship with the battery (B) senses battery temperature and discontinues the charging current when the termperature of the battery (B) rises after attaining full charge. In one form of the invention, a trickle charge path is provided to the battery (B) to maintain its charge state after the full charge has been attained. The trickle charge path is provided by an impedance shunting the thermostat (TS1') and is operative as a current path when the thermostat (TS1') is in its open condition. The trickle charge path can be a resistor (Rt) where the thermostat (TS1') is in the DC part of the charger circuit, or a capacitor where the thermostat is in the AC part of the charge circuit. A latching function may be performed by a pair of thermostats (TS1', TS2) so that the charger circuit is ''latched'' into its trickle charge operating state after the attainment of a full charge condition, this preventing undesired cycling of the charge current between the full charge and trickle charge conditions. A switching circuit may be provided by which the charging current and energy stored in the battery (B) can be provided to a load (M) so that the charger circuit can function as a supplemental power supply as well as a battery charger.</p> |
